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求助effect这个词的问题

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求助effect这个词的问题
在翻词典的时候看到effect作为"影响,效应,结果"的意思时有+an和s,自己觉得,难道影响还是可数的啊?而且词典标明C和U,意思说有可数和不可数两种情况.
请问effect这个词作为a change that sb/sth causes in sb/sth else;a result解释的时候,什么时候可数,什么时候不可数,
求助effect这个词的问题
字典一
effect
■ noun
a change which is a result or consequence of an action or other cause.▶an impression produced in a person's mind:his words had a soothing effect.
the state of being or becoming operative:the law came into effect.▶the extent to which something succeeds or is operative.
(effects) the lighting,sound,or scenery used in a play or film.
(effects) personal belongings.
Physics a physical phenomenon,typically named after its discoverer:the Coriolis effect.
字典二
effect
/ I5fekt; I`fZkt/ n
[C,U] (on sb/sth) change produced by an action or cause; result or outcome 效应; 结果; 后果:the effects of heat on metal 热对金属产生的效应 * Did the medicine have any effect/a good effect?这药有什麽疗效[疗效好]吗?* The film had quite an effect on her.这影片对她影响极大.* I tried to persuade him,but with little or no effect.我尽力劝他,他根本不听.
[C,U] impression produced on the mind of the spectator,listener,reader,etc (esp in plays,films,broadcasts,paintings,etc) (观众、 听众、 读者等)头脑 中所产生的印象(尤指在戏剧、 电影、 广播、 绘画等方面):The general effect of the painting is overwhelming.这幅画给人总的印象是很有气势.* The stage lighting gives the effect of a moonlit scene.舞台灯光产生月夜景色的效果.* She only dresses like that for the effect it creates/for effect.她仅仅为了装样子才那样打扮.* The science fiction film had some marvellous special effects.这部科幻电影有些特殊效果美妙绝伦.
effects [pl] (fml or law 文或律) personal property; possessions 个人财产; 财物:personal effects 个人财产 * household effects 家庭财物.
(idm 习语) bring/put sth into ef`fect cause sth to come into use 使某物开始使用:The new system will soon be put into effect.新系统即将启用.come into ef`fect (esp of laws,rules,etc ) reach the stage of being in use (尤指法律、 规则等)实行,实施:The new seat-belt regulations came into effect last week.新的安全带规则上周开始实施.give effect to sth (fml 文) cause sth to become active or produce a result 使某事物实行起来; 使生效:The new ruling gives effect to the recommendations of the special committee.这一新裁定使特别委员会的推荐生效.in ef`fect (a) for practical purposes; in fact 实际上; 事实上:The two systems are,in effect,identical.这两种制度实际上一模一样.(b) (of a rule,law,etc) in use (指规则、 法律等)有效:Some ancient laws are still in effect.有些古时的法律现在仍然有效.of/to no ef`fect not having the result intended or hoped for 没有预期的或希望的结果; 无效:My warning was of no effect.我的警告无济於事.* We warned them,but to no effect.我们警告过他们,但完全没用.strain after effects/an effect => strain1.take ef`fect (a) produce the result intended or required 产生预期的或要求的结果; 生效:The aspirins soon took effect.服下的阿司匹林药片很快见效了.(b) come into force or use; become active 实施; 实行; 起作用:The new law takes effect from tomorrow.新法令明日起实行.to good,etc ef`fect producing a good,etc result or impression 产生好的等结果或印象:The room shows off her paintings to good effect.这个房间把她绘画的优点充分显示出来.to this/that ef`fect with this/that meaning or information 有这样[那样]的意思或内容:He told me to get out,or words to that effect.他说了一句叫我走开之类的话.to the effect that...with the meaning,or giving the information,that...大意为...:He left a note to the effect that he would not be returning.他留下一张字条,大意是说他不回来了.